.column {
	background:
		linear-gradient(
			to right,
			rgba(0,0,0,0) 0% 10%,
			rgba(0,0,0,0.2) 10% calc(10% + 1px),
			rgba(0,0,0,0.8) 17% calc(17% + 1px),
			rgba(0,0,0,0.5) calc(17% + 1px),
			rgba(0,0,0,0) 30%,
			rgba(0,0,0,0.5) calc(30% + 1px),
			rgba(0,0,0,0.3),
			rgba(0,0,0,0.7) calc(40% - 1px) 40%,
			rgba(0,0,0,0.3) calc(40% + 1px),
			rgba(0,0,0,0),
			rgba(0,0,0,0.3) calc(60% - 1px),
			rgba(0,0,0,0.7) 60% calc(60% + 1px),
			rgba(0,0,0,0.3),
			rgba(0,0,0,0.5) calc(70% - 1px),
			rgba(0,0,0,0) 70%,
			rgba(0,0,0,0.5) calc(83% - 1px),
			rgba(0,0,0,0.8) calc(83% - 1px) 83%,
			rgba(0,0,0,0.2) calc(90% - 1px) 90%,
			rgba(0,0,0,0) 90% 100%),
		linear-gradient(
			to right,
			rgba(102,255,136,0) 0% 10%,
			rgba(102,255,136,1) 10% 90%,
			rgba(102,255,136,0) 90% 100%);
}